SMAPVEX19-22: L-Band Vegetation Water Dynamics at Harvard Forest

SMAPVEX19-22 campaign data captures L-band radiometer measurements over a red oak forest at Harvard Forest, Massachusetts, from late April to mid-October 2019. The dataset includes concurrent in-situ measurements of canopy leaf water potential, dielectric constant, soil moisture, temperature, and tree xylem properties. Its primary goal is to study the sensitivity of L-band vegetation optical depth (VOD) to changes in vegetation water potential over a growing season.

Use Cases

• Calibrating/validating satellite-based soil moisture and vegetation optical depth (VOD) products from missions like SMAP.
• Modeling the relationship between L-band microwave emission and in-situ vegetation water potential.
• Analyzing diurnal and seasonal cycles of vegetation dielectric properties and their impact on remote sensing signals.
• Studying the co-variability of soil moisture, air temperature, and canopy water status within a forest ecosystem.

Strengths

• Provides a continuous L-band radiometer time series over a nearly six-month growing season (late April to mid-October 2019).
• Includes intensive, concurrent ground truth measurements over four days in early July 2019, covering leaf water potential, dielectric constant, and tree xylem properties.
• Dataset is part of a coordinated NASA campaign (SMAPVEX19-22), indicating a structured experimental design.

Limitations

• Critical metadata is missing: column names, row counts, file sizes, and specific data formats are unknown across all platforms.
• Conflicting 'last updated' dates exist (2019-10 17 vs. 2026-04-10), creating uncertainty about data versioning and maintenance.
• The spatial scale is limited to a single tower location overlooking a specific red oak forest stand.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Field campaign deploying an L-band radiometer on a tower alongside in-situ sensors for soil, air, and vegetation measurements.

Time Range

Late April to mid-October 2019, with intensive sampling in early July 2019.

Freshness

2026-04-10 19:23:01.650973

Geography

Harvard Forest, Massachusetts, USA (a tower overlooking a red oak forest stand).